Computer real-time control method for monitoring temperature trend of aluminum cell

Abstract

The invention discloses an aluminum electrolysis heat tendency computer real-time control method which can adapt the superheat or overcooling change of the tank circumstance in a wider range and monitor the superheat degree of the electrolytic tank in real time, which belongs to the automatic control field of the aluminum electrolysis. During the tank voltage analysis and control step, the tank voltage is analyzed in real time, the amplitude variable is calculated according to the voltage change curve, which comprises an instantaneous amplitude and an analysis cycle amplitude; and a target voltage control step is set, and the target voltage is adjusted between the setting voltage and the upper limit of the safety voltage according to the fluctuation situation of the tank voltage. In the invention, the amplitude variable is induced into the aluminium fluoride adding rate control step and the aluminium oxide adding rate control step, and the aluminium quantity planning step is set, to ensure the electrolytic tank to operate under the states of material balance and energy balance. The superheat degree can be controlled in real time through the aluminum electrolysis heat tendency computer real-time control method, to ensure the electrolytic tank to operate under the stable and highly effective state, and the management intensity and difficulty of the operator of the electrolytic tank to be reduced.

Description

technical field [0001] The invention relates to an automatic control method for the production of an aluminum electrolytic cell, in particular to a computer real-time analysis control method for the cold and heat trend of the aluminum electrolytic cell. Background technique [0002] As we all know, in order to improve the utilization rate of the current efficiency of the aluminum electrolytic cell and implement stable control of the aluminum electrolytic cell, it is necessary to keep the control of the material balance and energy balance of the aluminum electrolytic cell as much as possible. Electrolyzer control includes two aspects: "material balance" and "energy balance" real-time coordinated control. [0003] The material balance of the electrolytic cell refers to: the quality of the material added to the electrolytic cell and the existing amount of electrolyte and aluminum liquid = raw materials such as alumina, aluminum fluoride and anode are consumed according to the m...

AI Technical Summary

Problems solved by technology

[0011] At present, the commonly used computer control system adopts the method of adjusting the concentration of alumina, that is, adjusting the amount of alumina added and the interval of alumina addition, to adjust the electrolytic cell material balance, and adjust the resistance of the electrolyte so as to maintain a higher current efficiency as much as possible. The control of the material balance of the tank; but because the system can only use the auxiliary analysis program to analyze and process the off-line measurement and laboratory data related to energy balance control, such as molecular ratio, etc., the analysis period is long, and the analysis in a day During the cycle, the electrolytic cell may have gone through several cycles of hot and cold cells, so it is impossible to monitor the superheat of the electrolytic cell in real time, and the real-time performance of energy balance control is not good.

Moreover, since the computer program cannot modify the set voltage, when the measured cell voltage exceeds the allowable range of the computer control program, the computer analysis fails, the control program becomes invalid, and the aluminum electrolytic cell cannot be automatically controlled. It can send out an alarm signal to notify the on-site operators to manually adjust the aluminum electrolytic cell, and the adaptability to the overcooling or overheating of the cell is narrow, and the degree of automation is low

Images